A black metal band that formed in Sweden in 1990, Nifelheim released a relatively small handful of albums in their career, and went through a number of lineup changes, but maintained enough of a following to keep the core of the band pressing on for nearly twenty years. Founders -- and twin brothers -- Per and Erik Gustavsson, who went by the names Hellbutcher (vocals) and Tyrant (bass), respectively, released their first album with longstanding partner in metal Demon in 1994. That particular self-titled affair was followed by 1997's Devil's Force, 2000's Servants of Darkness,...